<script lang="ts" setup name="GoodsImage">
import { computed, ref } from 'vue'
import { useMouseInElement } from '@vueuse/core'

defineProps<{
  images: string[]
}>()

// 默认高亮的下标
const active = ref(0)

const target = ref(null)
const { isOutside, elementX, elementY } = useMouseInElement(target)

const position = computed(() => {
  let x = elementX.value - 100
  let y = elementY.value - 100
  if (x < 0) x = 0
  if (y < 0) y = 0
  if (x > 200 ) x = 200
  if (y > 200 ) y = 200

  return {
    x,
    y
  }
})

</script>
<template>
  <div class="goods-image">
    <!-- 大图片容器 -->
    <div
      class="large" 
      :style="{
        backgroundImage:`url(${images[active]})`,
        backgroundPosition: `${-position.x * 2}px ${-position.y * 2}px`
      }"
      v-show="!isOutside"
    ></div>
    <div ref="target" class="middle">
      <img
        :src="images[active]"
        alt=""
      />
      <!-- 遮罩层 -->
      <div 
        v-show="!isOutside"
        class="layer"
        :style="{ left: position.x + 'px', top: position.y + 'px' }"
      ></div>
    </div>
    <ul class="small">
      <li
        v-for="( item, index ) in images" 
        :key="item" 
        :class="{ active: index === active }"
        @mouseenter="active = index"
      >
        <img
          v-lazy="item"
          alt=""
        />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
 .large {
   position: absolute;
   top: 0;
   left: 412px;
   width: 400px;
   height: 400px;
   box-shadow: 0 0 10px rgba(0,0,0,0.1);
   background-repeat: no-repeat;
   background-size: 800px 800px;
   background-color: #f8f8f8;
 }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
